21443513552424 has 24 divisors (see below), whose sum is σ = 58076182538010. Its totient is φ = 7147837850784.

The previous prime is 21443513552413. The next prime is 21443513552441. The reversal of 21443513552424 is 42425531534412.

21443513552424 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 3 + 51 + 3 + 552 + 42 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21426252322500 + 17261229924 = 4628850^2 + 131382^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21443513552424.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148913288487 + ... + 148913288630.

Almost surely, 2^{21443513552424} is an apocalyptic number.

21443513552424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21443513552424 is an abundant number, since it is smaller than the sum of its proper divisors (36632668985586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21443513552424 is a wasteful number, since it uses less digits than its factorization.

21443513552424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297826577129 (or 297826577122 counting only the distinct ones).

The product of its digits is 2304000, while the sum is 45.

The spelling of 21443513552424 in words is "twenty-one trillion, four hundred forty-three billion, five hundred thirteen million, five hundred fifty-two thousand, four hundred twenty-four".